NY murder-rape suspect removed monitor in 1 min.

New York State Police lead David Renz out of the North Syracuse state police barracks Friday, March 15, 2013. Renz, 29, abducted a school librarian and her daughter as they left a gymnastics class at a mall in the Syracuse suburb of Clay at about 9 p.m. Thursday, according to state police. Troopers said he bound both victims, raped the child and drove a short distance to a spot where the girl managed to escape, possibly as her mother was being killed. She was helped by a passing motorist and was being treated at a hospital. Her mother died from multiple stab wounds. Renz was caught by a trooper as he tried to escape into some woods, police said. (AP Photo/The Syracuse Newspapers, Dick Blume) NO SALES

SYRACUSE, N.Y. (AP) — Federal authorities say a man charged with killing a woman and raping her 10-year-old daughter after a carjacking at a New York mall last week was able to remove and reassemble his court-ordered electronic monitoring bracelet in about a minute before carrying out the attacks.

Local media report that a U.S. probation officer says 29-year-old David Renz managed to cut the device from his ankle and put it back together so quickly that it didn’t prompt the company in Colorado that makes the monitors to notify court officers in Syracuse.

The official says the officers had told the company not to notify them when the ankle monitor’s signal was interrupted for a short period of time because the officers were getting tampering alerts every time the devices were knocked against bathtubs or walls.